Frontier of Microtribology.

High speed microtribology with quartz crystal resonators.

Quartz resonators in contact with metal-covered spheres have been used to study the tribology of micron-sized metal-metal contacts at high speed (1 m/sec and high frequency (12 MHz), while maintaining a shear amplitude in the nanometer range. The data aquisition is based on ring-down experiments, where the electrical excitation is periodically interrupted and the free decay of the oscillation i...

Finding efficient frontier of process parameters for plastic injection molding

Product quality for plastic injection molding process is highly related with the settings for its process parameters. Additionally, the product quality is not simply based on a single quality index, but multiple interrelated quality indices. To find the settings for the process parameters such that the multiple quality indices can be simultaneously optimized is becoming a research issue and ...

In-situ studies of cartilage microtribology: roles of speed and contact area.

The progression of local cartilage surface damage toward early stage osteoarthritis (OA) likely depends on the severity of the damage and its impact on the local lubrication and stress distribution in the surrounding tissue. It is difficult to study the local responses using traditional methods; in-situ microtribological methods are being pursued here as a means to elucidate the mechanical aspe...

Frontier Sores

(1) An acute phagedenic ulcer, circular in outline with sharp punched out edges usually commencing on the site of some trivial abrasion not necessarily of recent origin. The rapid increase in area and depth of the ulcer was appalling. Within 24 or 48 hours a trivial abrasion might become an ulcer as big as a rupee and with deep fascia exposed in its base. Considerable swelling of surrounding ti...

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